EP1816501A1 - Optische Vorrichtung - Google Patents

Optische Vorrichtung Download PDF

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Publication number
EP1816501A1
EP1816501A1 EP07250450A EP07250450A EP1816501A1 EP 1816501 A1 EP1816501 A1 EP 1816501A1 EP 07250450 A EP07250450 A EP 07250450A EP 07250450 A EP07250450 A EP 07250450A EP 1816501 A1 EP1816501 A1 EP 1816501A1
Authority
EP
European Patent Office
Prior art keywords
optical
signal beam
filter
demultiplexed
waveguide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07250450A
Other languages
English (en)
French (fr)
Other versions
EP1816501B1 (de
Inventor
Akiyoshi c/o Legal Aff. & Intell. Prop. Dept Ide
Yasunori c/o Legal Aff. & Intell. Prop. Iwasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of EP1816501A1 publication Critical patent/EP1816501A1/de
Application granted granted Critical
Publication of EP1816501B1 publication Critical patent/EP1816501B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
    • G02B6/29368—Light guide comprising the filter, e.g. filter deposited on a fibre end
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4246—Bidirectionally operating package structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched

Definitions

  • the present invention relates to an optical device suitable for use as a wavelength-multiplex optical terminal for demultiplexing a light beam in a particular wavelength range from signal light beams in various wavelength range, i.e., light beams of communication service signal or video signal light beams, transmitted through an optical fiber.
  • monitor devices are associated with respective optical fibers, they are alone required to have a considerable size.
  • a monitor device monitors an optical signal by extracting a portion of the optical signal. It is desirable for a monitor device to be able to monitor an optical signal without significantly attenuating the optical signal.
  • a broadcasting downstream signal wavelength is added to upstream and downstream signal wavelengths of IP (Internet Protocol) services through a single optical fiber in the new services.
  • IP Internet Protocol
  • a customer premises facility is required to include a B-ONU (Broadband Optical Network Unit) that is need for conventional IP services and a V-ONU (Video-Optical Network Unit) for receiving broadcasting services.
  • B-ONU Broadband Optical Network Unit
  • V-ONU Video-Optical Network Unit
  • the subscriber needs to have a wavelength-multiplexing optical terminal for processing upstream and downstream signals having different wavelengths.
  • there is a possibility to transmit a downstream video signal at another wavelength and a wavelength-multiplexing optical terminal for three wavelengths will be required to handle all those signals.
  • the wavelength-multiplexing optical terminal mainly comprises a WDM (Wavelength Division Multiplexing) filter, a light-detecting unit (e.g., a photodiode) for receiving a downstream signal, and a light-emitting device (e.g., a laser diode) for transmitting an upstream signal.
  • WDM Widelength Division Multiplexing
  • a light-detecting unit e.g., a photodiode
  • a light-emitting device e.g., a laser diode
  • a bandpass filter rejection filter
  • wavelength-multiplexing optical terminals are mainly classified into a microoptics design using a lens and a PLC design using an optical waveguide, as shown in OPTORONICS, January 2004, page 173 .
  • the V-ONU-compatible optical device fabricated according to the microslitting technology comprises a wavelength-demultiplexing thin-film substrate inserted in an oblique silt directly defined in an optical fiber and a light-detecting component disposed above the optical fiber for detecting an optical signal beam demultiplexed by the wavelength-demultiplexing thin-film substrate.
  • the V-ONU-compatible optical device thus constructed is inexpensive to manufacture, and yet incorporates an integrated combination of the wavelength-demultiplexing function and the light-detecting function.
  • a bandpass filter may be disposed on the optical path of the demultiplexed optical signal beam in order to increase the optical signal beam attenuation in the cut-off range.
  • At least a medium from which the beam is emitted to the optical path changer comprises the waveguide, and the filter is disposed on the waveguide. Consequently, the medium to which the beam is emitted from the optical path changer (changing its optical path) and the medium from which the beam is applied to the filter are identical to each other. Therefore, the medium is optically uniform for improved and stable characteristics.
  • the optical path changer may comprise a guide, the waveguide and the guide being juxtaposed on a surface of the optical fiber, and a totally reflecting film disposed on an end face of the guide which faces the waveguide.
  • the light-detecting unit 20 is disposed on the optical path of the demultiplexed optical signal beam 38 that has passed through the filter 18.
  • the light-detecting unit 20 comprises a CAN-type photodiode 46 and a housing 48 housing the photodiode 46 therein.
  • an optical device 10Ad resides in that the sum of the angles ⁇ 1 + ⁇ 2 is 90°, and the angle ⁇ 3 of inclination of the filter 18 is equal to or smaller than - 0.5°. These specific angle values satisfy the above equation (1).
  • the structure can easily be realized by changing the angle ⁇ 3 of inclination.
  • the demultiplexed optical signal beam 38 that is guided out of the optical fiber 26 travels successively through the cladding layer 72 and the refractive index matching agent 80, and enters the waveguide 16.
  • the demultiplexed optical signal beam 38 travels substantially straight to the end face of the waveguide 16 and the refractive index matching agent 80, and then is applied to and reflected by the totally reflecting film 44 of the optical path changer 40 to change its optical path.
  • the demultiplexed optical signal beam 38 is then propagated through the waveguide 16 and passes through the filter 18 on the surface of the waveguide 16.
  • the demultiplexed optical signal beam 38 is applied perpendicularly to the filter 18, a portion of the demultiplexed optical signal beam 38 may be reflected by the surface of the filter 18, i.e., the interface between the filter 18 and air, and return as a reflected beam to the optical path changer 40, the optical demultiplexer 14, and the optical fiber 26.
  • the attenuated level of the reflected beam from the surface of the filter 18 is greater than if the demultiplexed optical signal beam 38 is applied perpendicularly to the filter 18.
  • the angle ⁇ 3 of inclination of the filter 18, i.e., the angle of incidence of the demultiplexed optical signal beam 38 is set to 0.5°
  • the reflected beam reflected from the surface of the filter 18, i.e., the interface between the filter 18 and air, and returning to the optical fiber 26 is attenuated to - 30 dB. If the angle ⁇ 3 of inclination of the filter 18 is 1° or greater, then the reflected beam can be attenuated more. Therefore, the reflected beam can sufficiently be attenuated even in view of the diffraction angle (spreading angle) of the demultiplexed optical signal beam 38.
  • the optical device 10A according to the first embodiment is fabricated according to the microslitting technology and has the filter 18 placed on the optical path of the demultiplexed optical signal beam 38.
  • the optical device 10A is capable of effectively attenuating the beam reflected from the filter 18. Consequently, the optical device 10A allows a system incorporating a V-ONU-compatible optical device to have improved overall characteristics.
  • the tapered surface 70 on the surface of the optical fiber 26 doubles as a positioning member for positioning the optical path changer 40 with respect to the optical fiber 26, the optical device 10A can be assembled with ease.
  • the filter 18 With the filter 18 being in the form of a BPF, the filter 18 can provide better characteristics (a desired attenuating level in the cut-off range) if the angle of incidence of the beam on the filter 18 is smaller. If the angle of incidence of the beam on the filter 18 is simply to be reduced, then the optical path changer 40 for reducing the angle of incidence needs to be provided between the optical demultiplexer 14 and the photodiode 46, and the filter 18 needs to be provided between the optical path changer 40 and the photodiode 46. Therefore, the optical path from the optical demultiplexer 14 to the photodiode 46 has an increased length tending to increase the loss.
  • the waveguide 16 is disposed directly above the optical fiber 26, the length of the optical path of the demultiplexed optical signal beam 38 is reduced, and the thickness of the refractive index matching agent 80 disposed between the optical fiber 26 and the waveguide 16 is also reduced.
  • the optically unstable region is thus reduced for enhanced optical uniformity of the demultiplexing optical path.
  • the optical device 10B differs from the optical device 10A in that a lens-combined CAN-type photodiode 82 is accommodated in the first through hole 58 in the housing 48.
  • the lens-combined CAN-type photodiode 82 comprises a CAN-type photodiode 84 and a ball lens 86 mounted thereon which has a diameter of 1.5 mm, for example.
  • the ball lens 86 is accommodated in the first through hole 58 such that it faces the filter 18, thereby designing the optical device 10B with ease.
  • the optical device 10C differs from the optical device 10B according to the second embodiment in that the guide 42 of the optical path changer 40 and the waveguide 16 with the filter 18 disposed on the upper surface thereof are accommodated in the first through hole 58 in the housing 48.
  • the optical device 10C allows the filter 18 (thin film) to be formed in a reduced area for efficiently utilizing the thin film of the filter 18.
  • a step 88 having a dimension ranging from 0.03 to 0.15 mm should preferably be disposed between the upper surface of the guide 42 and the upper surface of the waveguide 16. The step 88 is effective to prevent the refractive index matching agent 80 from protruding onto the surface of the filter 18 when the guide 42 and the waveguide 16 are installed in place.
  • An optical device 10D according to a fourth embodiment of the present invention will be described below with reference to FIG. 8.
  • the optical device 10D is of substantially the same structure as the optical device 10A according to the first embodiment except that the optical path changer 40 comprises a totally reflecting film 90 disposed on the end face of the waveguide 16 which is present on the optical path of the demultiplexed optical signal beam 38, and the guide 42 (see FIG. 1) is dispensed with.
  • the totally reflecting film 90 may comprise a thin metal film of Au (gold), Al (aluminum), or the like.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Integrated Circuits (AREA)
EP07250450A 2006-02-03 2007-02-02 Optische Demultiplex-Vorrichtung Expired - Fee Related EP1816501B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006027028 2006-02-03
JP2006342853A JP4796951B2 (ja) 2006-02-03 2006-12-20 光デバイス

Publications (2)

Publication Number Publication Date
EP1816501A1 true EP1816501A1 (de) 2007-08-08
EP1816501B1 EP1816501B1 (de) 2011-11-09

Family

ID=37944800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07250450A Expired - Fee Related EP1816501B1 (de) 2006-02-03 2007-02-02 Optische Demultiplex-Vorrichtung

Country Status (3)

Country Link
US (1) US7376297B2 (de)
EP (1) EP1816501B1 (de)
JP (1) JP4796951B2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010107602A (ja) * 2008-10-29 2010-05-13 Fuji Xerox Co Ltd 光伝送装置及び電子機器
CN102356573B (zh) * 2011-08-18 2014-09-17 华为技术有限公司 光收发一体组件和光收发模块
US20190052369A1 (en) * 2017-08-08 2019-02-14 Macom Technology Solutions Holdings, Inc. Techniques for high speed optoelectronic coupling by redirection of optical path

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01307707A (ja) * 1988-06-06 1989-12-12 Nippon Telegr & Teleph Corp <Ntt> 光結合回路
DE4205750A1 (de) 1992-02-25 1993-08-26 Siemens Ag Optischer demultiplexer
EP1321790A2 (de) 2001-12-04 2003-06-25 Matsushita Electric Industrial Co., Ltd. Substrat für optische Gehäuse und optische Vorrichtung
WO2006035906A1 (ja) 2004-09-29 2006-04-06 Ngk Insulators, Ltd. 光デバイス

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01307707A (ja) * 1988-06-06 1989-12-12 Nippon Telegr & Teleph Corp <Ntt> 光結合回路
DE4205750A1 (de) 1992-02-25 1993-08-26 Siemens Ag Optischer demultiplexer
EP1321790A2 (de) 2001-12-04 2003-06-25 Matsushita Electric Industrial Co., Ltd. Substrat für optische Gehäuse und optische Vorrichtung
WO2006035906A1 (ja) 2004-09-29 2006-04-06 Ngk Insulators, Ltd. 光デバイス
EP1795930A1 (de) 2004-09-29 2007-06-13 Ngk Insulators, Ltd. Optische einrichtung

Also Published As

Publication number Publication date
US20070183708A1 (en) 2007-08-09
EP1816501B1 (de) 2011-11-09
US7376297B2 (en) 2008-05-20
JP4796951B2 (ja) 2011-10-19
JP2007233342A (ja) 2007-09-13

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